Numerical Study on the Aerodynamic Performance of Multi-Blade Rotor Cavity in the Gas Circulating Pump of Fuel Cell

doi:10.7652/xjtuxb202103006

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Numerical Study on the Aerodynamic Performance of Multi-Blade Rotor Cavity in the Gas Circulating Pump of Fuel Cell

更新时间：2025-07-09

- Numerical Study on the Aerodynamic Performance of Multi-Blade Rotor Cavity in the Gas Circulating Pump of Fuel Cell
- Vol. 55, Issue 3, Pages: 46-56(2021)
- 作者机构：
  
  兰州理工大学能源与动力工程学院,兰州,730050
- 作者简介：
- 基金信息：
- DOI：10.7652/xjtuxb202103006
  CLC： TK91
- Online First：10 March 2021，
  
  Published：2021
- 稿件说明：
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Numerical Study on the Aerodynamic Performance of Multi-Blade Rotor Cavity in the Gas Circulating Pump of Fuel Cell[J]. 2021, 55(3): 46-56.
DOI：

Numerical Study on the Aerodynamic Performance of Multi-Blade Rotor Cavity in the Gas Circulating Pump of Fuel Cell[J]. 2021, 55(3): 46-56. DOI： 10.7652/xjtuxb202103006.

摘要

为了研究转子间隙、转子叶数与凸轮式气体循环泵气动特性曲线之间的定量关系

并获得不同叶数转子径向激励力的分布规律

基于对称性原理

采用数学分析法和坐标变换法推导了3～6叶的圆弧渐开线圆弧型转子型线方程

并分别选择5种不同的转子间隙加以研究。基于动网格技术和RNG k-ε湍流模型

对不同间隙、不同叶数的转子进行三维非定常数值分析

揭示转子间隙、叶数对气体循环泵流量/压力特性、激励力的影响规律

并通过实验进行了验证。研究表明:随着转子间隙由0.1 mm增大到0.3 mm

不同叶数的转子出口平均流量、容积效率均呈下降趋势

且3叶转子的下降幅度最大

分别下降了0.009 4 kg·s

-1

、28.6%; 3叶、4叶转子在0.15 mm间隙时流量脉动强度相对最低

5叶、6叶转子在0.25 mm间隙时流量脉动强度相对最低; 泵出口平均流量、出口平均总压均与转子叶数呈反比关系

随着叶数的增加

转子腔内压力分布得到改善

内部增压过程更为稳定; 随着叶数增多

转子径向激励力的x轴分量F

的脉动幅值和脉动强度显著降低

但叶数对转子径向激励力的y轴分量F

的影响不显著。

Abstract

In order to study the quantitative relationships of the rotor clearance and the number of rotor blades with the aerodynamic characteristic curve of the cam-type gas circulating pump

and to obtain the distribution rule of the radial excitation force of the rotor with different blade numbers

based on the symmetry principle

the arc involute arc rotor profile equations of 3 to 6 blades rotor are derived by using mathematical analysis method and coordinate transformation method

with five different rotor clearances selected to study. Based on dynamic mesh technology and

RNG k-ε turbulence model

three-dimensional unsteady numerical simulation on the rotors with different blade numbers and clearances are performed. The influences of rotor clearance and number of blades on the flow rate/pressure characteristics and excitation force of gas circulating pump are revealed and verified by experiments. The results show that with the increase of rotor clearance from 0.1 mm to 0.3 mm

the average flow rate and volumetric efficiency of the rotor outlet with different blade numbers show a downward trend

and the three-blade rotor has the largest decline

decreased 0.009 4 kg·s

-1

and 28.6% respectively. The three-blade and four-blade rotors have the lowest flow pulsation intensity when the clearance is 0.15 mm; and the five-blade and six-blade rotors have the lowest flow pulsation intensity when the clearance is 0.25 mm. The average flow rate and the average total pressure at the outlet are inversely proportional to the number of rotor blades. With the increase of the number of blades

the pressure distribution in the rotor cavity is improved

and the internal pressurization process is more stable. As the number of blades increases

the pulsation amplitude and intensity of the rotor radial excitation force component F

are significantly reduced

but the influence of the number of blades on the rotor radial excitation force component F

is not significant.

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